Brake



Nov.'9, 1937; R. A. GoEPFRlcH BRAKE Filed Dec. 21, 1935 INVENToR.

` ToRNEY Patented Nov. 9, 1937 UNITED STATE s PATENr ori-lcs Ind., a corporation o! Indiana Application December 2l, 1935, Serial No. 55,527

4Claiml.

This invention relates to brakes, and is illustrated as embodied in an internal expanding automobile brake of the shiftable-anchorage type. An object of the invention is to provide a 5 simple mechanical operating mechanism, preferably of a type which can be actuated alternative- 1y either by the service connections or the emergency connections.

In one desirable arrangement, a floating lever arranged to act on the ends of the shoes or equivaient friction means, and which is arranged adjacent the anchor in the type of brake illustrated, is actuated to apply the brake by a lever extending generally at right angles through the backing plate, and which acts on the floating lever at 'oneend and has a cable or other operating means connected to its other end. Preferably the floating lever moves in the space between the backing plate and the brake shoes.

In the arrangement illustrated the floating lever extends past the anchor, and is operatively engaged by an auxiliary lever (shown as fulcrumed on the brake anchor) operated by a cableI c r the like extending through the backing plate. In this arrangement one cable forms part of the service connections and the other forms part 4of the emergency connections.

The above and other objects and features of the invention, including various novel combinau tions scription of the illustrative embodiment shown in the accompanying drawing, in which:

Figure l is a partial vertical section through a I' brake embodying my invention, just inside the head of the brake drum, and showing parts of the shoes in side elevation;

Figure 2 is a partial section on the line 2-2 of Figure 1, showing the mounting of the lever a passing through the backing plate; and

Figure 3 is a partial section vertically through all three levers. on the line 3-3 of Figure 1.

The brake selected for illustration includes a rotatable drum I0, at the open side of which is asupport such as a backing plate I2, the drum and support forming a substantially closed brake chamber which houses the brake friction means,

shown as T-section shoes I4 and i6. The backing plate 50 an anchor or post I2 between the ends of the shoes.

The return springs of the brake, indicated at 2l and 22, may be tensioned between the shoes respectively and the anchor I2. I prefer to make 5g the spring 22, connected to the secondary shoe.

of parts and desirable particular constructions, will be apparent from the following de I2 also carries an anchorage such asl (CL 18S-78) stronger than the spring 20, connected to primary shoe.

The present invention relates to the means for applying the brake, whether or not the brake is constructed exactly as shown.

As illustrated, the shoes are applied by prying them apart by means of a -floating lever 24, swinging in the space between the backing plate and the shoes. and which is formed with a slot 26 encircling the anchor I8 and equal in width to the' diameter of the anchor, so that the lever can float circumferentially of the brake without interference from the anchor. The lever 24 has thrust means such as lugs 28 between and in thrust engagement with the ends of the shoes on opposite sides of the anchor i8. 'I'he lever 26 may be provided with a return spring 30 tensioned between the lever and the backing plate.

'I'he portion of the lever 24 below the anchor I4 is shown as provided with a lateral integral lug 22 engaged by the edge of an auxiliary lever 34 fulcrumed on the anchor I8. The lever 34 -also swings in the space between the backing plate and the shoes, and has attached to its ends operating means such outwardly through the backing plate.

The cable 36 may pass exteriorly of. the brake' through a flexible Bowden-type conduit (not shown) secured at its opposite ends to the backing plate and to the vehicle frame. Cable 36 forms part of the `service connections'forthe brakes. l

According toan important feature of the present invention, thelever 24 may also be actuated by a lever 40 passing through and fulcrumed in f a slot in the backing plate and arranged generally perpendicular to the backing plate. One

end of the lever 40 is rounded and is in direct thrust engagement with the portion of the lever 24 above the anchor. The other end of the lever 40 has attached thereto operating means such as a. cable 42, which may form part of the emergency brake operating connections.

The slot through which the lever 40 passes is shown covered by a plate 44 carried by the lever. A bowed leaf spring 46 is shown engaging the backing plate at its ends and acting resiliently outward at its center on a pin carried by the lever 40, to hold the oifset inner end of the lever against the inner face of the backing plate when the brake is not applied, and when the brake is applied to hold against the edge of the slot in the backing plate the notch formed by the two parts of the lever.

A stamping 4l spot-welded to the inner face 55 the as a cable 36 extending 25 thebaekingjatehasitsfreeendslottedto embrace and guide the lever 4I.

While one illustrative embodiment has been described detail, it is not my intention to limit scope of the inventionto that particular t.or otherwise thanbythetermsof the appended claims.

I dum: l

l. A brake comprising a backing plate having friction with an anchor between the ends of the friction means, an operating lever formed and arranged thrust engagement with one of the portions of the operating lever and having actuating means extending through the backing plate. and an auxiliary lever extending through the backing plate and. having `one end acting on the otherv of said portions and having actuating means connected to its other end. e

2. A brake comprising a backing plate having friction means mounted thereon and provided with an anchor between the ends of the friction means, an operating lever movable in the space between the backing plate and the friction means and formed Aand arranged to iioat relatively to said anchor circumferentially of the brake and having thnlst parts acting on said ends and having `portions extending on opposite sides of said anchor. a second lever mounted on the anchor and also movable in the space between the backing plate and the friction means and having a part in thrust engagement with one oi the portions of the operating lever and having actuatmeans mounted thereon and provided ingmeansextendlngthraighthe and an auxiliary lever extending generally at right angles to the yandhavingoneendactingonthe portions and havingactuating toitsotherend.

8.Abrake Egg EEE

ends adjacent the anchor, an actuating arranged between the backing `plate friction means and arranged to o lever and which is provided with friction means mounted thereon having separable ends. a nesting applying device between the backing plate and the friction means having parts englsing said ends, an actuating lever between the backing plate and the friction means arranged to operate the applying device, and an auxiliary lever passing through and generally at right angles to the backing plate and having one end `operatively arranged 'to actuate said floating applying device and having operating means connected to its other end, said applying device and said actuating lever both being fulcrumed between said ends.

RUDOLPH A, GOEPPRIUH. 

